diff --git a/dotnet/001-connect-passwordless/connect.cs b/dotnet/001-connect-passwordless/connect.cs
index d71c2be..7e43621 100644
--- a/dotnet/001-connect-passwordless/connect.cs
+++ b/dotnet/001-connect-passwordless/connect.cs
@@ -12,7 +12,7 @@
     ?? throw new InvalidOperationException("COSMOS_ENDPOINT is not configured. Run: dotnet user-secrets set --file connect.cs \"COSMOS_ENDPOINT\" \"<your-endpoint>\"");
 
 var credential = new DefaultAzureCredential();
-var client = new CosmosClient(endpoint, credential);
+using var client = new CosmosClient(endpoint, credential);
 
 AccountProperties account = await client.ReadAccountAsync();
 Console.WriteLine($"Account: {account.Id}");